Combined pump and rotary engine



April 24, 1945. E J, MGFARLAND 2,314,445

COMBINED P UMP AND ROTARY ENGINE Filed June 5, 1942 2 Sheets-Sheet 1 April 1945- E. J. M FARLAND 2,374,445

COMBINED PUMP AND ROTARY ENGINE I Filed June a, 1942 ,-2 Sheets-Sheet 2 grime/1410a;

z cmz iarzmz Patented Apr. 24,

NT oF FicE f COMBINED PUMP AND ROTABYENGINE Edwin McFarland, Vulcan, Alberta canada Application June 3, 1942, Serial No. 445.603

5 Claims.

My invention relates to pumps and/or rotary engines of that general type which include a casing providing an expansible chamber sure rounding a rotary piston having a movable abut.

ment or vane in the periphery cooperating with a stationary abutment in the expansible chamber, and in which the fluid is either drawn through or forced into a passageway in the pisabutment or vane which may be mounted in the periphery of the rotary piston. l i l i In carrying out my invention a solid piston or rotor ill-fixed to a hollow shaft H-is enclosed in a circular casing between sideplatesn, l2

. thereof, and in order to provide the expansible chamber or annular recess l3 around the periphton leading totheexpansible chamber-and discharged through an outlet at one side of the stationary abutment by the operation of. the

vane working in the chamber.

The main objector myinvention is to provide an engine of this general character which may be employed either as. a rotary pump for drawing water or other fluid through the passageway in the piston and discharging it through the outlet in the abutment -operating after the manner of a rotary engine by introducing fluid 'under pressure into. the passageway to operate against the vane for'turning the piston to de velopmotive power for running machinery of any kind. l l My invention also contemplates the employment of plunger rodswhich may assist inoperat ing the vane carried by the rotary piston, in connection with a split ring or band forming a yielding partition inthe expansion chamber to vary the size thereof according to the pressure ofthe fluid acting on the. vane, as well as guide the vane pastthe abutmentgwhen the opposite end 1 portions of the ring or partition band are contracted by the expansion of the .major portion thereof under the influence :of fluid pressure in pumping or developing power.

With these principal objects in view mymvenr tion consists in :the construction: and marrange ment of parts, as hereinafter fully described'an specifically pointed out in the clairnsm In the drawings: l

@Fig. l is a side elevation of a combined pump Fig. 2 is a verticalsecucnal view throughthe center of the rotatable pistonand casing in which it operates.

. Fig. 3 is a similar view, showinga modifica tion and the position of the oscillating, vanein the operation. of pumping-in full lines-and its position-in dotted lines-when operating as a rotary engine. a Figy i is atransverse sectional .view through the center of the rotatable piston; and casing:

cry of thepiston the latter is "of slightly less diameter than the diameter of the casing; while therim M of the casing-which forms the outer wall of the annular recess--is bolted between i the side plates, and the hollow shaft is extended and rotary enginein accordance'withmy inven- .tion. a

at its ends and supportecl' in bearings l5, l5. at the upper ends of diverging legs l6, l6 forming the supportingframe of the engine.

The fluid for either the pumpingor driving operations enters the annular recess or expansion chamber from the .hollow shaft by way of a passage ll extending radially through the solid piston, and associated withthe piston there is amovable abutment .or. oscillatingtvane l8 pivoted in recesses in the periphery of the piston to operate in the expansible chamber and cooperatewith a stationary abutment I9 secured to the rim of the stationary casing and presenting oppositely inclined surfacesover which the vane passes. :The operating. fluid, such as oil,

which enters the expansion chamber through the aforementioned passageway in the piston is discharged through an opening 20*in thehstationary abutment at one side thereof. into a'pipe 2| for carryingit off. a I

By reference to Fig. 5 it will benoted that the oscillating vane is pivoted between lv-shape recesses 22 and23 extending across the periphery .of thepiston, and that said vane is provided with pivot-ears 24seated in recesses 24' in the piston to form correspondingears' through which the pintle 25 passes. It will benote d, also, that the passageway [1 opens into the recess 23 through the wallthereof opposite to that to th upper end of whichthevane is pivoted. Theioperation. of the movable abutment or 'vane intaddition to being influenced by the fluid pressure an dcentrifugal force is actuatedby plunger rods 26 and '21 working in openings therefor in the piston, the rod 26 being thicker than its companion rod for more effective operation by centrifugal force, and to offset the greater weight of rod 26 a light spring 28 is used in connection with. rod. 2i, said spring being in- Y Fig.5 isa detailview of the rotary piston, and

Fig. 6 is; a detail side: elevation of the movable terposed between collars 29 and 3B fixed to the rod and pistonrespectively. These plunger-nods are normally operated for causing the movable abutmentor vane to pass over the stationary 

